My roommate just gave me a ton of pasta that expired in March of '09. None of the bags have been opened and I'm really strapped for cash and tempted to keep them on hand...what's the worst that could happen to me if I ate it?

My dad is a supermarket manager and he always brings home expired dry goods that tend to sit in their house for months afterwords until someone finally uses them or I take them to my place and use them.